Parenchyma is the most common type of ground tissue. These cells are relatively unspecialized but highly versatile. Parenchyma cells are typically thin-walled and can be found in the cortex, pith, and leaf mesophyll. They play a key role in photosynthesis, storage, and tissue repair. Parenchyma cells can also become specialized into other types of cells, contributing to the plant's growth and development.